Ball mill



A. BENNA BALL MILL Filed June 2 192- 4 Sheets-Sheet 1 m h an v H n QM .HHN U k v N WM. m m m m Qh .NN \\\\l Q 3 QM, kl U Q Q 0 0 m O V Ni. Q o 0O L l 6 O m m Sept. 28 1926.

A. BENNA BALL MILL Filed June 2 192 4 Sheets-Sheet 2 Sept. 28 1926. 1,601,466

A. BENNA BALL MILL Filed June 2 1924 4 Sheets-Sheet 5 j za a 5/ Z7 0 v o a o o 28 Sept. 28 1926. 1,601,466

A. BENNA BALL MILL Filed June 2. 1924 4 Sheets-Sheet 4.

Angelo Benna Ukwk Patented Sept. 28, 1926.

NT 1 OFFICE. Y

' ANGELO BENNA, or JU'NEAU, TERRITORY OF ALASKA.

BALL

Application filed June 2,

This invention relates to mills, and more particularly to ball mills.-

An object of the invention is the provision of a design of ball mill whereby an increase in the grinding capacity may-be obtained.

A further object is to provide a ball mill of such a design that the water fed into the mill and fine material small enough to pass through the discharge screen, will pass quickly through the mill and be. discharged in a rapid and positive manner. I

By providing a construction which permits rapid discharge of the fine material, the grinding area of the mill is maintained in the best condition for rapid and efiicient grinding, the excess water and fine material being removed, permits the material to be ground to be thoroughly mixed with the grinding media. This further permits the use of a'low water level in the mill and all bouyant effects are eliminated.

In constructing the mill, I provide for a larger diameter of shell at the discharge end and a pumping arrangement to discharge all the material passing through the discharge screen.

In the accompanying drawings, I have shown one embodiment of the invention. Inthis showing:

Figure l'is a side elevation, parts being shown in section,

I Figure 2 is a vertical sectional view on line 22 of Figure 1,

Figure 3 is a similar view on line 33 of Figure 1,

Figure 4 is a similar view on line 4-4 of Figure 1,

Figure 5 is a perspective view of a at the discharge end of the shell,

' Figure 6 is a similar view of the inner element of the pumping apparatus, and,

Figure 7 is a similar view of the outer element of the pumping apparatus.

Referring to the drawings,thereference numeral 1 designates an outer shell whioh, as shown, tapers and which is larger atthe discharge end than at the inlet end. A screen 2 is arranged at the discharge end of the shell. A ring 3- is provided with a flange 4 adapted to receive rivets 5 passing through the shell to connect the ring thereto. An end 6 is connected to the ring 3 by means of bolts 7 and the ring 3 and end 6 provide a chamber at the discharge end of greater diameter than the diameter of the shell and spider MILL.

1924. Serial No. 717,413. A

as shown, a trunnion 8 is carried by the end 6. I

The pumping, apparatus consists of a spider'9 (see Figure 5), formed of an inner wall 10 adapted to be arranged in a central opening in the screen, (see Figure 2) and an outer wall 11. As shown, the outer Wallis curved and adapted to fit within the end of the trunnion 8. The spider is further provided with a curved wall teriorly thereof and substantially parallel to the outer wall 11. The space between the curved walls 11 and 12,-is divided by partitions 13, to form passages 14.

A liner 15, is arranged within the trim- 7 nion 8 and this liner is provided with spiders 16 and 17 adapted to receive a bolt 18. The head of the bolt is received in the squared opening 19 in the inner plate 10 of the spider 9. The spider is also supported by means of bolts 20, the heads of which are received in squared openings21, formed partially in the plate 10 and partially in the screen as shown in Figure 2 of the drawings, and locking the screen to the spider.

An inner pumpingelement 22 (see Figure 6) is arranged circumferentially of the spider 9. As shown, this element comprises a plate or disk 23, which is arranged adj acent the end 6 and which is provided with a plurality of radial ,Walls or partitions 24, adapted to be arranged in alinement with the partitions 13 of the spider. The outer edges of these partitions carry blades 25 arranged substantially parallel 'to the disk 23. Each blade terminates at a distance from the next adjacent partition, forming spaces or openings 26.

An outer pumping element is arranged circumferentially of the inner pumping element. As shown in Figure 7 of the drawings, the outer pumping element consists of a pair of disks-27 arranged in the same vertical plane as the disk 23 and the blades 25 respectively. These disks are. connected at their periphery by an annular member 28 and the space between the:- disks is divided into pockets by partitions 29 arranged in alinement with the partitions 13 and 24.

A filler ring 30 is arranged adjacent the periphery of the screen and the outer pumping element is held in position by bolts 31 passing through this .ring. The inner pumping element is provided with openings 32 for the reception of bolts which pass through 12 arranged inthe outer end 6. Adjacent its periphery, it is likewise provided with openings 33 for the reception of bolts which pass through the screen, the inner pumping element and the outer end 6.

The feed end of the mill is provided with a head 34, which is bolted to a ring 35, riveted to the shell. A driving gear 36 is bolted to the ring 35. Liners 37 are carried on the inner face of the head 34, and a filler ring 38 is arranged within the shell. The shell is provided with a man hole opening 39 and is further provided with breast liners 40. A trunnion 41 is carried by the head 34, and this trunnion is provided with a liner 42, having spiral ridges 43 to feed the material into the mill. A feed scoop 44 is arranged at the outer end of the trunnion liner.

In operation, the material is fed to the mill through the trunnion liner 42, the spiral ridges 43 acting as a conveyor to force the material into the mill. As the material is ground, it passes through the openings in the screen 2 and then passes through the openings 26 to the inner elementof the pumping device and is received in the space between the disk 23, the blade 25, and the partition 24. As the mill rotates, the material drops by gravity into the pockets formed by the partitions 290i the outer pumping element and remains in the pocket until the pocket moves upwardly above the center line. The material then feeds outwardly, the partitions 13, 24, and 29 acting as dividing walls and it passes through the passages 14 into the discharge trunnion 8. The material is prevented from flowing backwardly by the blades 25 of the inner pumping member. This provides a pumping device which removes the water and fine material in a positive and rapid manner and it passes through the screen and prevents any back-wash or pressure against the screen.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, andthat various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scopeof the subjoined claims.

I claim:

1. In a ball mill, a casing having a central discharge opening, a screen arranged adjacent the discharge end of said casing,'a spider arranged between said screen and said discharge opening, a pair of elements surrounding said spider, the inner element being arranged adjacent and co-extensive with said screen and having an inner wall adjacent said screen provided with spaced openings, the outer element extending outwardly radially a substantial distance be yond said casing and being closed on its periphery and sides to form pockets, and radial partitions arranged in said elements and said spider to deliver material to said central discharge opening.

2. In a ball mill, a casing, a ring secured to the outlet end of said casing providing a chamber of materially larger diameter than said casing, a hollow trunnion carried by said ring, a screen arranged within said casing adjacent the outlet end, a spider .arranged in said chamber, an inner member surrounding said spider adjacent and coextensive with said screen, said spider and said member being provided with radial partitions in alinement with each other, blades carried by the partitions of said member adjacent and parallel to said screen, the free ends of said blades extending toward and being spaced from the adjacent partition forming passages for material passing through said screen, and an outer member surrounding said inner member, said member being closed on its periphery and sides and being provided with radial partitions forming pockets.

3. In a ball mill. a casing, a screen arranged at the discharge end of said casing, a pair of rings secured to the outlet end of said casing and forming a chamber of larger diameterthan said casing, a spider arranged in said chamber, an element ar- 7 ranged in said chamber and surrounding said spider, alined radial walls carried by said element and said spider, the radial walls of said element extending outwardly radially beyond said casing, and a blade carried by each radial wall of said element adjacent said screen, the end of each blade extending toward and being spaced from one of the next adjacent radial walls of said element.

4. In'a ball mill, a casing having a central discharge opening, a screen arranged adjacent the outlet end of said casing, a

spider arranged exteriorly of said screen, said spider including a pair of curved parallel walls and having radial partitions therebetween forming passages communicating with said outlet opening, and an element surrounding said spider, said element being provided with radial partitions in alinement with the partitions of said spider and each being providedwith a blade arranged adjacent said screen and extending toward and spaced from the next adjacentpartition of said element.

5. In a ball mill, a casing or screen arranged adjacent the outlet end of said casing, a spider arranged on the outlet side of said screen, said spider including a palr or spaced walls having radial partitions therebet-ween :torming passages, an inner member surrounding said spider adjacent and coextensive with said screen, said member being provided with openings on the side adjacent said screen and being further provided with partitions in alinement with the partitions of said spider and an outer member surrounding said inner member, said outer member being entirely closed on its periphery and sides and provided with partit-ions to form a plurality of pockets in radial alinement with and communicating with the spaces between the partitions of said inner element.

6. In a ball mill, a casing havinga central discharge opening, a screen arranged adjacent the outlet end of said casing, a spider arranged exteriorly of said screen,

an inner member surrounding said spider, said member having an inner wall adjacent said screen provided with spaced openings, and an outer member surrounding said inner member and being closed at its periphery and sides, said spider and bothof said members being provided with radial partitions forming passages to deliver material through said openings to the discharge outlet of the mill.

In testimony whereof, I affix my signature,

ANGELO BENNA. 

